// Each book, music album, or movie will be an instance of a subclass of this class.
// Instances of this class should not be created. Specifying it as 'abstract' ensures
// that they cannot.

package library;

import java.util.Set;

public abstract class Item
{
	abstract public String getTitle();
	abstract public String getCreator();
	abstract public Set<String> getGroup();
	abstract public Set<String> getKeyword();
	abstract public void add(String... M);
	abstract public String toString();
}
